Fraction of measured reflectivity assigned to the ice phase using a very simple temperature-based scheme (=1.0 below Temp_min_mixph_K, 0.0 above Temp_max_mixph_K, and varying linearly between these two temperatures). The effective number concentration in a given bin will be given by N_T * ro_ipf for ice and N_T * (1-ro_ipf) for liquid. The IWC and LWC are scaled in a similar manner.